The Windows 10 ISO download will begin downloading to your computer. Step 1: Next, a dialogue box will ask you if you want to save a program called 'MediaCreationTool22H2.exe.' Select Save file. Under the header that says Create Windows 10 installation media, select the Download tool now button. To get started, head to the Windows 10 download page. The best way to get a Windows 10 ISO file is from Microsoft. USB flash drive or DVD (if creating installation media for another computer) A Windows ISO download tool (we'll show you where to get this)